I think I am having the problem described here:
http://community.jboss.org/thread/63817?tstart=1
However the given solution did not solve the problem. I added a jboss-app.xml in ear/META-INF:
<jboss-app>
<loader-repository>com.mydomain:loader=archiveName
<loader-repository-config>java2ParentDelegation=false</loader-repository-config>
</loader-repository>
</jboss-app>
After that, I stopped getting the conflicts, however I now get:
DEPLOYMENTS MISSING DEPENDENCIES:
Deployment "HornetQCoreDeployment::2" is missing the following dependencies:
Dependency "HornetQServer" (should be in state "Installed", but is actually in state "** NOT FOUND Depends on 'HornetQServer' **")
Deployment "JBossTransactionServices" is missing the following dependencies:
Dependency "TransactionManager" (should be in state "Installed", but is actually in state "** NOT FOUND Depends on 'TransactionManager' **")
Deployment "JMSConnectionFactoryManageMO" is missing the following dependencies:
Dependency "<UNKNOWN JMSConnectionFactoryManageMO>" (should be in state "Installed", but is actually in state "** UNRESOLVED Demands 'JMSServerManager' **")
Deployment "JMSQueueManageMO" is missing the following dependencies:
Dependency "<UNKNOWN JMSQueueManageMO>" (should be in state "Installed", but is actually in state "** UNRESOLVED Demands 'JMSServerManager' **")
Deployment "JMSServerMO" is missing the following dependencies:
Dependency "<UNKNOWN JMSServerMO>" (should be in state "Installed", but is actually in state "** UNRESOLVED Demands 'JMSServerManager' **")
Deployment "JMSTopicManageMO" is missing the following dependencies:
Dependency "<UNKNOWN JMSTopicManageMO>" (should be in state "Installed", but is actually in state "** UNRESOLVED Demands 'JMSServerManager' **")
Deployment "JndiBinder" is missing the following dependencies:
Dependency "jboss:service=Naming" (should be in state "Create", but is actually in state "** NOT FOUND Depends on 'jboss:service=Naming' **")
It's as if the container won't provide ANY classes, now.